CN110372902A - A kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic - Google Patents

A kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic Download PDF

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CN110372902A
CN110372902A CN201910678863.7A CN201910678863A CN110372902A CN 110372902 A CN110372902 A CN 110372902A CN 201910678863 A CN201910678863 A CN 201910678863A CN 110372902 A CN110372902 A CN 110372902A
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陈栋阳
陈煜�
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Abstract

The present invention relates to a kind of fluorine-containing polyfluorene ether anion-exchange membranes of side chain bi-quaternary ammonium salt ionic.Fluorine-containing polyfluorene ether compound containing dimethylamine sidechains and bromoalkane quaternary ammonium compounds are obtained the fluorine-containing polyfluorene ether compound of side chain bi-quaternary ammonium salt ionic by single step reaction by the present invention, and anion-exchange membrane then is made by solution casting method.The anion-exchange membrane has excellent mechanical property and thermal stability, and bromide ion conductivity is significantly improved than the fluorine-containing polyfluorene ether anion-exchange membrane of the side chain containing mono-quaternaries.

Description

A kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic
Technical field
The present invention relates to a kind of fluorine-containing polyfluorene ether anion-exchange membranes of side chain bi-quaternary ammonium salt ionic, belong to amberplex Material Field.
Background technique
Anion-exchange membrane is that containing positively charged group there is selection to penetrate anions in a kind of chemical structure The thin polymer film of function is widely used in electrodialysis, diffusion dialysis, water electrolysis, all-vanadium flow battery, alkaline fuel cell etc. Field.Due to high resistant vanadium performance, the features such as low fuel permeability, anion-exchange membrane is in all-vanadium flow battery and alkalinity combustion Expect that there is very big application potential in battery, the research and development and performance optimization of novel anionic exchange membrane material are also constantly subjected to science The concern on boundary and industry.However, the generally existing low conductivity of anion-exchange membrane currently on the market, stability difference etc. are asked Topic, it is difficult to realize the application of large-scale commercial.
Traditional quaternary anion-exchange membrane mainly passes through the particular functional on quaternizing agent and polymer backbone Group's reaction introduces cation group and is prepared.For example, Meng Yuezhong et al. (Chinese invention patent CN102516526B and document Int. J. Hydrogen Energy, 2012,37,16168-16176) disclose a kind of poly- containing quaternary ammonium salt side and fluorenyl Aryl oxide anion-exchange membrane, chloride conductance rate is 3.3 mS cm-1 at room temperature, and has enough mechanical strengths, energy Enough meet the application demand of alkaline fuel cell and all-vanadium flow battery.Such method is drawn cation group by single step reaction The specific position for entering polymer backbone prepares anion-exchange membrane, simple process, and reaction condition is mild.However, yin obtained The cation group of amberplex directs or through shorter aliphatic chain and is connected on main chain, and ion-mobility is lower, no Conducive to the aggregation of quaternary ammonium salt ion, effective anion transmission channel is formed, improves anionic conduction rate.Further, since ion Group is closer apart from polymer backbone, reduces the chemical stability of film to a certain extent.
Therefore, by introducing double quaternary ammonium ion flexible side-chains on fluorine-containing polyfluorene ether, side chain bi-quaternary ammonium salt ionic is synthesized Fluorine-containing polyfluorene ether anion-exchange membrane is conducive to the activity and aggregation extent that improve cation group in amberplex, with The anion-exchange membrane with outstanding ion transmission performance and chemical stability is obtained, anion-exchange membrane investigation of materials is sent out Exhibition has great importance.
Summary of the invention
The purpose of the invention is to overcome the deficiencies in the prior art, by introducing double quaternary ammonium ions on fluorine-containing polyfluorene ether Flexible side-chains synthesize a kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic.The side chain bi-quaternary ammonium salt from The fluorine-containing polyfluorene ether anion-exchange membrane of subtype has simple process, ionic conductivity height, good mechanical property, chemical stability height etc. Advantage has important application prospect in amberplex field.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic, by following structural formula side chain bi-quaternary ammonium salt from The fluorine-containing polyfluorene ether compound composition of subtype:
X is any anion in formula, and it be 10 ~ 400, y is 1 ~ 4 that m, which is 1 ~ 400, n,.
The preparation method of the fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic, specifically includes the following steps:
(1) it prepares the fluorine-containing polyfluorene ether compound of side chain bi-quaternary ammonium salt ionic: the fluorine-containing polyfluorene containing dimethylamine sidechains is etherified Conjunction object, which is dissolved in polar non-solute, is configured to solution A;Then, by 0.5 ~ 1.5 times of mole of above-mentioned dimethylamine group Bromoalkane quaternary ammonium compounds Br-y-QA, which is dissolved in polar non-solute, is configured to solution B;Then, by solution B in argon It is slowly dropped in solution A under the protection of gas, continues to stir 10 ~ 50 h at 20 ~ 80 DEG C after completion of dropwise addition;Finally, will reaction Object is fitted into dialysis bag, in deionized water dialysis 3 ~ 10 days, and drying 10 ~ 40 hours is removed water at 80 ~ 120 DEG C, obtains side The fluorine-containing polyfluorene ether compound of chain bi-quaternary ammonium salt ionic;
(2) it prepares anion-exchange membrane: the fluorine-containing polyfluorene ether compound of step (1) the side chain bi-quaternary ammonium salt ionic is dissolved in It is configured to the solution of 1 ~ 8 wt.% in polar non-solute, then casts on horizontal positioned glass plate, in 40 ~ 100 DEG C A conventional oven in dry 10 ~ 50 hours, in 60 ~ 150 DEG C of vacuum drying oven dry 10 ~ 50 hours to get side chain double seasons The fluorine-containing polyfluorene ether anion-exchange membrane of Ammonium Salt Ionic type.
The chemical structure of fluorine-containing polyfluorene ether compound containing dimethylamine sidechains described in step (1) is as follows:
It is 10 ~ 400 that m, which is 1 ~ 400, n, in formula;
The chemical structure of the bromoalkane quaternary ammonium compounds Br-y-QA is as follows:
Y is 1 ~ 4 in formula.
The concentration of solution A is 1 ~ 10 wt.% in step (1), and the concentration of solution B is 5 ~ 10 wt.%.
It is 1 ~ 5 mL/min that solution B, which is added drop-wise to the speed in solution A, in step (1).
Prepared anion-exchange membrane is in step (2) with a thickness of 40 ~ 80 μm.It is above in order to preferably realize the present invention Polar non-solute in the step includesN,NDimethyl acetamide,N,NDimethylformamide,NCrassitude Ketone, dimethyl sulfoxide, any one in 1,3- dimethyl-2-imidazolinone.
The obtained fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic of the present invention can be used as battery diaphragm Material.
Preparation method of the present invention be preferred embodiment, the predictable reasonable temperature of one of skill in the art, when Between and other reaction conditions be invention which is intended to be protected, it is not limited to above-mentioned reaction condition.
Fluorine-containing polyfluorene ether compound containing dimethylamine sidechains and bromoalkane quaternary ammonium compounds are passed through one by the present invention Step reaction obtains the fluorine-containing polyfluorene ether compound of side chain bi-quaternary ammonium salt ionic, and anion exchange then is made by solution casting method Film.
Compared with prior art, the present invention has the effect that
(1) raw material that the present invention uses is cheap for common industrial chemicals, is easy to get;
(2) present invention introduces quaternary ammonium salt group with reacting for bromine group by dimethylamine group, and reaction condition is mild, and passes through Adjust the ion exchange capacity that the content of dimethylamine group in polymer is controllably film-made.
(3) present invention is conducive to pendant cationic base using flexible bis-quaternary ammonium salt cationic side chain and fluorine-containing aromatic main chain Group mutually assembles in film forming procedure, mutually separates with main chain formation, to form ion transmission channel, therefore gained anion is handed over It changes film while there is excellent bromide ion conductivity and oxidation stability.
Detailed description of the invention
Fig. 1 is the side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE- prepared in the embodiment of the present invention 4 The nuclear magnetic resonance spectroscopy of 40-C3.
Fig. 2 is the side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE- prepared in the embodiment of the present invention 4 The infrared spectroscopy of 40-C3.
Fig. 3 is the side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE- prepared in the embodiment of the present invention 6 The nuclear magnetic resonance spectroscopy of 40-C6.
Fig. 4 is the side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE- prepared in the embodiment of the present invention 6 The infrared spectroscopy of 40-C6.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, With reference to embodiment to of the present invention Technical solution is described further, but the present invention is not limited only to this.
The preparation of the fluorine-containing polyfluorene ether compound PFE-40 of embodiment 1
Method in fluorine-containing polyfluorene ether compound PFE-40 reference literature prepare (Int. J. Hydrogen Energy, 2012, 37,16168-16176).By the 0.7434 g(1.6 mmol of fluorenyl bis-phenol DABPF containing dimethylamine group), bisphenol fluorene 0.8410 g(2.4 mmol) and 1.3500 g of decafluorobiphenyl (4.04 mmol) be dissolved in 12 mLN-In methyl pyrrolidone, Add 1.2g(8mmol) cesium fluoride and 0.5 g(12 mmol) calcium hydride, then reacts in the protection of argon gas at room temperature 24 h.After reaction, product is poured into be precipitated in 500 mL deionized waters and is precipitated, be re-dissolved in two after precipitating is collected by filtration It in chloromethanes, is subsequently poured into methanol and precipitating is precipitated, precipitating is collected by filtration, dry 24 hours at 80 DEG C of vacuum drying oven to get arriving Fluorine-containing polyfluorene ether compound PEF-40.Yield: 98%.
The preparation of the fluorine-containing polyfluorene ether compound PFE-20 of embodiment 2
Experimental procedure is same as Example 1, unlike the fluorenyl bis-phenol DABPF containing dimethylamine group and bisphenol fluorene feed intake Amount.In the present embodiment, the inventory of the fluorenyl bis-phenol DABPF containing dimethylamine group is 0.3717 g(0.80 mmol), bis-phenol The inventory of fluorenes is 1.1213 g(3.2 mmol).Reaction obtains fluorine-containing polyfluorene ether compound PFE-20.Yield: 97%.
The preparation of 3 side chain mono-quaternaries ionic polyarylether containing fluorene compound Q A-PFE-40 of embodiment
Synthesis (Int. J. in side chain mono-quaternaries ion polyarylether containing fluorene compound Q A-PFE-40 reference literature Hydrogen Energy, 2012,37,16168-16176).It will be obtained fluorine-containing in 1.00 g(1.16 mmol) embodiment 1 Polyfluorene ether compound PFE-40 is dissolved in 20 mLN-The solution of 5 wt.% is made in methyl pyrrolidone, then slowly to anti- Answer and 0.1 mL(1.8 mmol be added dropwise in system) iodomethane, after completion of dropwise addition, reaction be protected from light at room temperature under protection of argon gas into 20 h of row.After reaction, product is poured into be precipitated in 200 mL deionized waters and is precipitated, precipitating is then collected by filtration, uses third Ketone cleans 3 ~ 5 times, and 12 h are dried in vacuo at 80 DEG C, obtain side chain mono-quaternaries ion polyarylether containing fluorene compound Q A-PFE- 40。
The preparation of 4 side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-40-C3 of embodiment
Fluorine-containing polyfluorene ether compound PFE-40 obtained in 1.00 g(1.16 mmol) embodiment 1 is dissolved in 20 mLN- It is made the solution of 5 wt.% in methyl pyrrolidone, while by 0.45 g(1.74 of bromoalkane quaternary ammonium compounds Br-1-QA Mmol) it is dissolved in 4.5 mLN-The solution of 10 wt%, bromoalkane quaternary ammonium compounds Br-1-QA ginseng is made in methyl pyrrolidone It prepares according to the method in document (J. Mater. Chem. A, 2016,4,13938-13948).Then, in the protection of argon gas It is lower that bromoalkane quaternary ammonium compounds solution is slowly added dropwise in fluorine-containing polyfluorene ethereal solution by the speed of 5 mL/min, knot is added dropwise Shu Hou, in 40 DEG C of 40 h of reaction under the protection of argon gas.After reaction, product is fitted into dialysis bag, in deionized water Dialysis 5 days, deionized water twice was during which replaced daily.Then by product at 80 DEG C forced air drying 12 hours, then at 80 DEG C Vacuum drying 12 hours, obtains the fluorine-containing polyfluorene ether compound DQA-PFE-40-C3 of side chain bi-quaternary ammonium salt ionic;Yield: 96%. The data of the nuclear magnetic resonance spectroscopy of the compound are as follows:1H NMR (400 MHz, DMSO-d6) δ 7.94 (s, 1H), 7.44 (d, 2H), 7.27 (d, 1H), 7.06 (d, 2H), 6.96 (s, 1H), 4.75 (s, 1H), 3.15 (m, 1H), 3.04 (t, 1H), 2.20 (s, 1H) infrared datas are as follows: FT-IR (cm-1) υ 3413,3039,2923, 2850, 1647, 1599, 1487, 1240, 1207, 1171, 1070, 982, 816, 729.The side chain being prepared The nuclear magnetic resonance spectroscopy of bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-40-C3 is shown in Fig. 1, and infrared spectrogram is shown in figure 2。
The preparation of 5 side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-20-C3 of embodiment
Experimental procedure is same as Example 4, the difference is that fluorine-containing polyfluorene ether raw material PFE-40 uses the fluorine-containing polyfluorene in embodiment 2 instead Ether compound PFE-20, inventory are 1.55 g(2.32 mmol).Reaction obtains side chain bi-quaternary ammonium salt ionic polyarylether Close object DQA-PFE-20-C3.Yield: 98%.
The preparation of 6 side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-40-C6 of embodiment
Experimental procedure is same as Example 4, the difference is that bromoalkane quaternary ammonium compounds raw material uses Br-4-QA instead, feeds intake Amount is 0.53 g(1.74 mmol).Reaction obtains side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-40- C6.Yield: 96%.The data of the nuclear magnetic resonance spectroscopy of the compound are as follows:1H NMR (400 MHz, DMSO-d6) δ 7.95 (s, 1H), 7.42 (d, 2H),7.34(s, 2H), 7.14 (s, 1H), 4.71 (d, 1H), 3.09 (s, 2H), 1.71 (d, 1H), 1.33 (s, 1H).Infrared data are as follows: FT-IR (cm-1) υ 3413,3066,3037,2927, 2862, 2819, 2757, 1649, 1602, 1487, 1205, 1170, 1070, 981, 816, 746, 729.Preparation The hydrogen nuclear magnetic resonance spectrogram of obtained side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-40-C6 is shown in Fig. 3, red External spectrum figure is shown in Fig. 4.
The preparation of 7 side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-20-C6 of embodiment
Experimental procedure is same as Example 4, unlike raw material use 1.00 g(1.50 mmol instead) it is fluorine-containing poly- in embodiment 2 Fluorenes ether compound PFE-20 and 0.68 g(2.25 mmol of bromoalkane quaternary ammonium compounds Br-4-QA).Reaction is contained 20 mol% long side chain bi-quaternary ammonium salt ionic polyarylether containing fluorene compound DQA-PFE-20-C6.Yield: 97%.
Embodiment 8 is based on above-mentioned quaternary ammonium salt ionic polyarylether containing fluorene compound and prepares anion-exchange membrane
The above-mentioned side chain mono-quaternaries ionic of 0.5 g and the fluorine-containing polyfluorene ether compound of side chain bi-quaternary ammonium salt ionic are taken, is dissolved in 10 mL N-5 wt% solution are made in methyl pyrrolidone, then pours and casts from horizontal positioned plate glass, in constant temperature oven In 80 DEG C drying 12 hours, then 80 DEG C drying 12 hours in vacuum drying oven, i.e., form membranaceous product in glass plate.By film from It is peeled on glass plate, then impregnates in deionized water, target side chain mono-quaternaries ionic and side chain bi-quaternary ammonium salt is made Ionic polyarylether containing fluorene anion-exchange membrane product.
9 side chain mono-quaternaries ionic of embodiment and the fluorine-containing polyfluorene ether anion exchange film properties of side chain double quaternary ammonium salt type Test
Using titration test ion exchange capacity, bromide ion conductivity is tested using AC impedence method, using universal testing machine Tensile property is tested, using (the VO of 1M2)2SO42 weeks test oxidation stabilities of solution soaking at room temperature.Through characterizing, side chain single cropping ammonium The performance of salt ion type and the fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic is as shown in the table:
The performance of 1 side chain mono-quaternaries ionic of table and the fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic
The test data of table 1 shows that the anion-exchange membrane QA-PFE-40 compared to side chain mono-quaternaries ionic, side chain are double Close, but the bromine of the ion exchange capacity of quaternary ammonium salt ionic anion-exchange membrane DQA-PFE-20-C3 and DQA-PFE-20-C6 Ionic conductivity significantly improves, it was demonstrated that distribution of the regulation ionic group in anion-exchange membrane has obvious beneficial effect. DQA-PFE-40-C3 and DQA-PFE-40-C6 is due to having ion exchange capacity more higher than other samples, bromide ion conduction Rate further increases.

Claims (7)

1. a kind of fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic, which is characterized in that by following structural formula The fluorine-containing polyfluorene ether compound composition of side chain bi-quaternary ammonium salt ionic:
X is any anion in formula, and it be 10 ~ 400, y is 1 ~ 4 that m, which is 1 ~ 400, n,.
2. a kind of preparation side of the fluorine-containing polyfluorene ether anion-exchange membrane of side chain bi-quaternary ammonium salt ionic as described in claim 1 Method, which is characterized in that specifically includes the following steps:
(1) it prepares the fluorine-containing polyfluorene ether compound of side chain bi-quaternary ammonium salt ionic: the fluorine-containing polyfluorene containing dimethylamine sidechains is etherified Conjunction object, which is dissolved in polar non-solute, is configured to solution A;Then, by 0.5 ~ 1.5 times of mole of above-mentioned dimethylamine group Bromoalkane quaternary ammonium compounds Br-y-QA, which is dissolved in polar non-solute, is configured to solution B;Then, by solution B in argon It is slowly dropped in solution A under the protection of gas, continues to stir 10 ~ 50 h at 20 ~ 80 DEG C after completion of dropwise addition;Finally, will reaction Object is fitted into dialysis bag, in deionized water dialysis 3 ~ 10 days, and drying 10 ~ 40 hours is removed water at 80 ~ 120 DEG C, obtains side The fluorine-containing polyfluorene ether compound of chain bi-quaternary ammonium salt ionic;
(2) it prepares anion-exchange membrane: the fluorine-containing polyfluorene ether compound of step (1) the side chain bi-quaternary ammonium salt ionic is dissolved in It is configured to the solution of 1 ~ 8 wt.% in polar non-solute, then casts on horizontal positioned glass plate, in 40 ~ 100 DEG C A conventional oven in dry 10 ~ 50 hours, in 60 ~ 150 DEG C of vacuum drying oven dry 10 ~ 50 hours to get side chain double seasons The fluorine-containing polyfluorene ether anion-exchange membrane of Ammonium Salt Ionic type.
3. preparation method according to claim 2, which is characterized in that step (1) is described to contain the fluorine-containing of dimethylamine sidechains The chemical structure of polyfluorene ether compound is as follows:
It is 10 ~ 400 that m, which is 1 ~ 400, n, in formula;
The chemical structure of the bromoalkane quaternary ammonium compounds Br-y-QA is as follows:
Y is 1 ~ 4 in formula.
4. preparation method according to claim 2, which is characterized in that the concentration of solution A is 1 ~ 10 wt.% in step (1), The concentration of solution B is 5 ~ 10 wt.%.
5. preparation method according to claim 2, which is characterized in that solution B is added drop-wise to the speed in solution A in step (1) Degree is 1 ~ 5 mL/min.
6. preparation method according to claim 2, which is characterized in that prepared anion exchange film thickness in step (2) Degree is 40 ~ 80 μm.
7. preparation method according to claim 2, which is characterized in that the polar non-solute includesN,NDiformazan Yl acetamide,N,NDimethylformamide,NMethyl pyrrolidone, dimethyl sulfoxide, in 1,3- dimethyl-2-imidazolinone Any one.
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CN111530511A (en) * 2020-06-18 2020-08-14 福州大学 Column [5] arene cross-linked fluorine-containing polyarylether anion exchange membrane and preparation method thereof
CN111662446A (en) * 2020-06-17 2020-09-15 福州大学 Fluorine-containing polyarylether anion exchange membrane with low surface resistivity and high oxidation stability and preparation method thereof
CN111871222A (en) * 2020-07-16 2020-11-03 福州大学 Preparation method of quaternary ammonium salt functionalized fluorine-containing polyfluorene ether anion exchange membrane based on pillared [5] arene
CN112563520A (en) * 2020-10-27 2021-03-26 浙江大学 Homogeneous catalyst and catalyst layer of anion exchange membrane fuel cell
CN114133555A (en) * 2021-12-09 2022-03-04 福州大学 Preparation method of cross-linked fluorine-containing polyfluorene ether anion exchange membrane

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CN114133555A (en) * 2021-12-09 2022-03-04 福州大学 Preparation method of cross-linked fluorine-containing polyfluorene ether anion exchange membrane
CN114133555B (en) * 2021-12-09 2023-05-16 福州大学 Preparation method of cross-linked fluorine-containing polyfluorene ether anion exchange membrane

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